Jeep 56027873 Sensor-COOLANT Temperature

The coolant temperature indicator system is composed of a light or temperature gauge mounted in the dash and a coolant temperature sending unit mounted on the engine. The coolant temperature sensor is located at the front of the engine, next to the thermostat. On the models covered, there is only one coolant temperature sensor, which functions as an indicator for both the PCM and the instrument panel. If an overheating indication occurs, check the coolant level in the system and then make sure the wiring between the light or gauge and the sending unit is secure, and all fuses are intact. When the ignition switch is turned on and the starter motor is turning, the indicator light (if equipped) should be on (overheated engine indication). If the light is not on, the bulb may be burned out, the ignition switch may be faulty, or the circuit may be open. As soon as the engine starts, the light should go out and remain out unless the engine overheats. Failure of the light to go out may be due to a grounded wire between the light and the sending unit, a defective sending unit, or a faulty ignition switch. Check the coolant to make sure it is the proper type. Note: Plain water may have too low a boiling point to activate the sending unit. Disconnect the electrical connector from the sensor. Wrap the threads of the new sensor with Teflon tape to prevent leaks. Unscrew the sensor. Be prepared for some coolant spillage. Install the sensor and tighten it securely. Connect the electrical connector. Check the coolant level after the replacement unit has been installed and top up the system, if necessary. Check now for proper operation of the gauge and sending unit. Observe the system for leaks after operation.

The ECT sensor for the 3.7L V6 and 4.7L V8 engines is located at the front of the intake manifold. To remove, disconnect the electrical connector and unscrew it using a deep socket. Wrap the threads with Teflon sealing tape before installation. For the HEMI engine, the ECT sensor is located at the front of the engine block, under the air conditioning compressor. To access it, remove the drive belt and unbolt the compressor. Disconnect the electrical connector and unscrew the sensor using a deep socket.

Be very cautious when dealing with the Engine Coolant Temperature (ECT) sensor besides damage to it will lead to a disability of the entire fuel injection system. Start with the removal of negative terminal of the battery and then dismantle the engine coolant. The ECT sensor is mounted midshaft on the left side of the cylinder head above the airflow sensor, behind the CMP sensor and it is not easily accessible. Depend on it to harness the ECT sensor, the CMP sensor has to be unwrung, and if the latter requires the deep socket for its removal, then the battery and battery tray have to be unbolted as well. It is recommended to take out the CMP sensor at this point, as it will be somewhat in the way. Then turn the ECT sensor anti-clockwise and remove it from the cylinder head then remove the electrical connector of the said sensor. It is advisable to cover the threads of the new ECT sensor with Teflon tape in a bid to minimize coolants leakage. Remove is the antonym of installation and involves the tighting of the ECT sensor to the appropriate torque signs, before refilling the cooling system.

The coolant temperature indicator system includes a warning light or temperature gauge and a coolant temperature sending unit. The ECT sensor acts as an informational sensor for the PCM and the sending unit. If the light doesn't activate, the bulb could be faulty, the ignition switch might have issues, or there could be a circuit defect. Make sure the coolant mixture is correct.

The coolant temperature indicator system includes a dashboard light or gauge and a sending unit on the engine. Some vehicles have multiple sending units, but only one is used for the indicator. If the car has an electric cooling fan, avoid the fan blades as they can start unexpectedly. If overheating is indicated, check the coolant level, ensure secure wiring between the light/gauge and sending unit, and check all fuses. To test, ground the wire to the sending unit with the ignition on. Once the engine starts, the light should go out unless the engine overheats. If it doesn't, it could be a grounded wire, defective sending unit, or faulty ignition switch. Check the coolant type, as plain water may not activate the sending unit. If replacing the sending unit, unscrew it from the engine and install the replacement with sealant on the threads. Let the engine cool before removal and expect some coolant loss. Check the coolant level after replacement.